n. the state of being without a flaw or defect

n. (mathematics) the number of significant figures given in a number; "the atomic clock enabled scientists to measure time with much greater accuracy"

n. the state of excelling or surpassing or going beyond usual limits

n. being undiluted or unmixed with extraneous material

n. the state or an instance of being imperfect

n. an imperfection in a plan or theory or legal document that causes it to fail or that reduces its effectiveness